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US6171384B1 - High surface area silicate pigment and method - Google Patents

High surface area silicate pigment and method Download PDF

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Publication number
US6171384B1
US6171384B1 US09/072,424 US7242498A US6171384B1 US 6171384 B1 US6171384 B1 US 6171384B1 US 7242498 A US7242498 A US 7242498A US 6171384 B1 US6171384 B1 US 6171384B1
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silicate pigment
amorphous silicate
pigment according
coating
silicate
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US09/072,424
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Donald P. Conley
Gary W. Loock
Barry W. Preston
Michael C. Withiam
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JM Huber Corp
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JM Huber Corp
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Assigned to J.M. HUBER CORPORATION reassignment J.M. HUBER CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CONLEY, DONALD P., LOOCK, GARY W., PRESTON, BARRY W., WITHIAM, MICHAEL C.
Priority to CA002334426A priority patent/CA2334426A1/fr
Priority to EP99920300A priority patent/EP1077899B1/fr
Priority to DE69910198T priority patent/DE69910198D1/de
Priority to PCT/US1999/009664 priority patent/WO1999057059A1/fr
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
    • C09C1/28—Compounds of silicon
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
    • C09C1/28—Compounds of silicon
    • C09C1/30—Silicic acid
    • C09C1/3045—Treatment with inorganic compounds
    • C09C1/3054—Coating
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/12—Surface area
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/14—Pore volume
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/16—Pore diameter
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/19—Oil-absorption capacity, e.g. DBP values

Definitions

  • the invention relates to a high surface area amorphous silicate pigment, and a method of making the same. More particularly, the invention relates to a high surface area amorphous silicate pigment which is useful in a variety of recording media coatings, especially coatings for ink jet printer recording sheets, and a method of making the same.
  • Ink jet printing systems can generally be divided into two types: continuous stream and drop-on-demand.
  • continuous stream ink jet systems ink is emitted in a continuous stream under pressure through at least one orifice or nozzle. The ink stream is then perturbed, causing it to break up into droplets at a fixed distance from the orifice. At the break-up point, the droplets are charged in accordance with digital data signals and passed through an electrostatic field which adjusts the trajectory of each droplet, thereby directing the droplet to a gutter for recirculation or to a specific location on a recording medium.
  • drop-on-demand systems a droplet is expelled from an orifice directly to a position on a recording medium in accordance with digital data signals. A droplet is not formed or expelled in drop-on-demand systems unless it is to be placed on the recording medium.
  • Ink jet inks may be water-based, or may employ an alkylene glycol or other solvent base. Regardless of the type of ink used, the surface chemistry of the recording medium largely determines the print quality. Therefore, recording media for ink jet and other printing systems have utilized pigment-containing coatings to sorb the solvent of the ink (i.e., dry the ink) and hold its dye-component to maximize the color development and visual effect of the ink. It is known that highly porous, high surface area pigments are especially effective in this regard, as such pigments maximize the amount of ink dye positioned in the path of light reflected from the substrate to the eye, while at the same time minimizing the dye absorbed in the pigment layer or paper substrate.
  • the invention is an amorphous silicate pigment having a pore volume of at least about 4.0 ml/g as measured by mercury intrusion, a BET surface area of at least about 300 m 2 /g, preferably about 400 to 500 m 2 /g, and an Al 2 O 3 content of about 2.0 to 10.0 wt %, preferably about 3.0 to 7.0 wt %.
  • the invention preferably has a linseed oil absorption of about 180 to 250 cc/100 g, more preferably about 190 to 220 cc/100 g.
  • the invention preferably has a pore volume as measured by mercury porosimetry of about 4 to 7 cc Hg/g with a pore size maximum of about 0.005 to 0.030 ⁇ m diameter, more preferably a pore volume of about 5 to 6 cc Hg/g with a pore size maximum of about 0.014 ⁇ 0.003 ⁇ m diameter.
  • the invention preferably has an average particle size as measured by laser light scattering of about 2 to 8 ⁇ m, more preferably about 4 to 6 ⁇ m.
  • the invention preferably exhibits a CTAB surface area of about 150 to 300 m 2 /g, more preferably about 170 to 250 m 2 /g.
  • the method of the invention involves the addition of a reactive source of aluminum to a reaction medium during the precipitation of a silicate pigment.
  • the temperature of the reaction medium during the precipitation reaction is controlled between about 50 to 85° C.
  • the reactive source of aluminum is sodium aluminate, aluminum chloride and/or aluminum sulfate (alum), and is more preferably alum.
  • the invention also encompasses a coating for a print recording substrate, the coating containing a binder and an amorphous silicate pigment having the physical characteristics described above.
  • the coating is in the form of an aqueous slurry containing at least 30% pigment solids of an amorphous silicate pigment having the physical characteristics described above such that the Brookfield viscosity of the pigment slurry at 10 rpm is less than about 10,000 cps.
  • the invention further encompasses a print recording medium comprising a print recording substrate and an amorphous silicate pigment having the physical characteristics described above.
  • the FIGURE is a graphic depiction of the Brookfield viscosity and Hercules rheology of a coating color containing a silicate pigment in accordance with the invention and a coating color containing a conventional pigment.
  • the silicate of the invention can be loaded at 30% pigment solids in aqueous suspension. Over 30% pigment solids can easily be attained with the silicate of the invention when a simple phosphate, acrylate or other dispersant known in the art is utilized in the suspension.
  • the remarkable combination of excellent rheology and high porosity provided by the inventive silicate enhances coating performance, i.e., the inventive silicate enables color development beyond that achievable with conventional synthetic fillers.
  • the silicate pigment of the invention is a medium structure silicate in accordance with the definitions set forth in the J. Soc. Cosmet. Chem., 29, 497-521 (August 1978) and Pigment Handbook: Volume 1, Properties and Economics, 139-159, (P. A. Lewis 2d ed. 1988).
  • the silicate pigment has a mercury intrusion pore volume of at least about 4.0 ml/g and a BET surface area of at least about 300 m 2 /g, preferably about 300 to 500 m 2 /g.
  • the silicate pigment contains Al 2 O 3 at about 2.0 to 10.0 wt %, preferably about 3.0 to 7.0 wt %.
  • silicate pigments possessing this combination of physical characteristics surprisingly provide a previously unknown and remarkable combination of rheological and color development advantages in recording media applications. While not being limited to a particular theory, we believe that the high alumina content of the inventive silicate pigment results in a unique silicate structure that surprisingly combines the performance advantages of a highly porous, high surface area material with excellent rheological characteristics.
  • silicate pigments in accordance with the invention preferably have a linseed oil absorption of about 180 to 250 cc/100 g, more preferably about 190 to 220 cc/100 g; a pore volume as measured by mercury porosimetry of about 4 to 7 cc Hg/g with a pore size maximum of about 0.005 to 0.030 ⁇ m diameter, more preferably a pore volume of about 5 to 6 cc Hg/g with a pore size maximum of about 0.014 ⁇ 0.003 ⁇ m diameter; an average particle size as measured by laser light scattering of about 2 to 8 ⁇ m, more preferably about 4 to 6 ⁇ m, and a CTAB surface area of about 150 to 300 m 2 /g, more preferably about 170 to 250 m 2 /g.
  • the method of the invention involves the addition of a reactive source of aluminum to a reaction medium during a precipitation reaction of a silica pigment, wherein the reaction medium is maintained at a temperature of about 50 to 85° C. during precipitation.
  • the reactive source of aluminum is not particularly limited, and is preferably at least one of sodium aluminate, aluminum chloride and aluminum sulfate (alum). More preferably, the reactive aluminum source is alum.
  • the silica precipitation reaction is preferably conducted in a manner conventionally known to produce a low structure silica in accordance with the “low structure silica” definitions set forth in the J. Soc. Cosmet. Chem., 29, 497-521 (March 1978) and Pigment Handbook: Volume 1, Properties and Economics, 139-159, (P. A. Lewis 2d ed. 1988).
  • the pigment may be micronized or milled by any conventional means to enhance total porosity.
  • the coating for a print recording medium in accordance with the invention comprises a binder and an amorphous silicate pigment having the physical characteristics in accordance with the invention as described above.
  • the binder can be any material suitable for print recording substrate applications, examples of which include starch, latex, polyvinyl alcohol and other such binders as known in the art.
  • the coating is in the form of an aqueous slurry containing at least 30% pigment solids of the amorphous silicate pigment of the invention such that the Brookfield viscosity of the coating at 10 rpm is less than about 6,000 cps.
  • the print recording medium of the invention is a print recording substrate which contains an amorphous silicate pigment having physical characteristics in accordance with the invention as described above.
  • the print recording substrate can be any material that can accommodate a silicate pigment in accordance with the invention, examples of which include paper, mylar, fabric, vinyl and acetate films.
  • BET surface area is determined by the BET nitrogen adsorption methods of Brunaur et al., J. Am. Chem. Soc., 60, 309 (1938).
  • CTAB external surface area of silica and silicates is determined by absorption of CTAB (cetyltrimethylammonium bromide) on the silica surface.
  • CTAB cetyltrimethylammonium bromide
  • the silica or silicate is mixed with CTAB, and the excess CTAB is separated by centrifugation and evaluated by titration with sodium lauryl sulfate using a surfactant electrode.
  • the external surface of the silica is determined from the quantity of CTAB adsorbed (analysis of CTAB before and after adsorption). Specifically, about 0.5 g of silica is placed in a 250-ml beaker with 100.00 ml CTAB solution (5.5 g/L), mixed on an electric stir plate for 1 hour, then centrifuged for 30 minutes at 10,000 rpm.
  • Triton X-100 is added to 5 ml of the clear supernatant in a 100-ml beaker.
  • the pH is adjusted to 3.0-3.5 with 0.1 N HCl and the specimen is titrated with 0.0100 M sodium lauryl sulfate using a surfactant electrode (Brinkmann SUR15O1-DL) to determine the endpoint.
  • a surfactant electrode Brinkmann SUR15O1-DL
  • Pore volume as measured by mercury intrusion is determined using an Autopore II 9220 Porosimeter (Micromeritics Corporation). This instrument measures the void volume and pore size distribution of various materials. Mercury is forced into the voids as a function of pressure and the volume of mercury intruded per gram of sample is calculated at each pressure setting. Total pore volume as expressed herein represents the cumulative volume of mercury intruded at pressures from vacuum to 60,000 psi. Increments in volume (cc/g) at each pressure setting are plotted against the pore radius corresponding to the pressure setting increments.
  • the peak in the intruded volume versus pore radius curve corresponds to the mode in the pore size distribution and identifies the most common pore size in the sample.
  • a contact angle of 140° and a surface tension of 485 dyne/cm are used.
  • Brookfield viscosity (RVT type) is determined on a sample of pigment in aqueous suspension. The sample is agitated for one minute at a rate of 120 rpm without entrapment of air and allowed to stand for 5 ⁇ 0.1 minutes. The Brookfield spindle appropriate to cover the expected viscosity range is immersed in the sample to the middle of the spindle notch. After 5 revolutions at the selected spindle speed the spindle is stopped and the viscosity value is recorded. The average of two trials is used as the viscosity value so long as the two trials have values within ⁇ 50 cps; otherwise the measurements are repeated.
  • Hercules viscosity is measured using a DV-10 High Shear Viscometer.
  • the Hercules Hi-Shear Viscometer utilizes concentric cylinders with a well-defined geometry to measure a fluid's resistance to flow and to determine its viscous behavior in this simple-shear flow field. Because the gap between the rotating inner cylinder (bob) and the restrained outer cylinder (cup) is very small, the annular flow between the two cylinders approximates a velocity-driven (Couette) flow. When a fluid sample is confined between the bob and cup, rotation of the bob generates a velocity gradient across the gap. This gradient is termed shear rate and defined as the change in linear velocity (cm/sec) between two fluid elements divided by their distance in centimeters.
  • shear rates are expressed in reciprocal seconds (sec ⁇ 1 ). While rotation of the bob causes the fluid to flow, its resistance imposes a shear stress on the inner wall of the cup, measured in dynes/cm 2 . Absolute viscosity can be calculated at any shear rate.
  • Rheograms of thixotropic fluids are characterized by a hysteresis loop between the increasing shear rate (up) and the decreasing shear rate (down) curves.
  • the loop quantifies power loss during continuous input of energy into the fluid sample undergoing testing and it is independent of any thermal effects.
  • the amount of thixotropic breakdown is sensitive to the previous shear history of the fluid, since structure reforms upon cessation of flow, but also depends on the rate of change of shear value.
  • Oil absorption, using linseed oil is determined by the rubout method.
  • the rubout method involves mixing oil and a silicate on a smooth surface with a spatula until a stiff putty-like paste is formed.
  • the silicate sorptive capacity is determined by measuring the quantity of oil required to saturate the silicate, i.e., the quantity of oil required to form a paste mixture which will curl when spread out.
  • Particle size is determined using a Leeds and Northrup Microtrac II.
  • a laser beam is projected through a transparent cell which contains a stream of moving particles suspended in a liquid.
  • Light rays which strike the particles are scattered through angles which are inversely proportional to their sizes.
  • the photodetector array measures the quantity of light at several predetermined angles. Electrical signals proportional to the measured light flux values are then processed by a microcomputer system to form a multi-channel histogram of the particle size distribution.
  • a reactor was charged with 1929 gallons of a 13.3% solution of sodium silicate.
  • the silicate solution was heated in the reactor to 65° C., then more of the same silicate solution added to the reactor at 67.6 GPM while, simultaneously, a sulfuric acid/alum mixture of 11.4% sulfuric acid and 15.4% alum was added at 43.4 GPM.
  • the ratio of the acid to alum in the added mixture was 1:0.66.
  • the silicate addition was halted, and the acid/alum addition continued for approximately 14 minutes.
  • the reaction mixture was then allowed to digest for 10 minutes at 65° C., after which silicate precipitate was filtered, washed, spray-dried to 10.0% maximum moisture and milled to an average particle size of 7.3 ⁇ m.
  • Example 1 The product silicate pigment in accordance with the invention (referred to hereinafter as “Example 1”) exhibited the characteristics reported in Table I.
  • a reactor was charged with 181 liters of a 13.3% solution of sodium silicate.
  • the silicate solution was heated in the reactor to 70° C., then more of the same silicate solution added to the reactor at 6.3 LPM while, simultaneously, a sulfuric acid/alum mixture of 11.4% sulfuric acid and 15.4% alum was added at 4.1 LPM.
  • the ratio of the acid to alum in the added mixture was 1:0.81.
  • the silicate addition was halted, and the acid/alum addition continued for approximately 14 minutes.
  • the reaction mixture was then allowed to digest for 10 minutes at 70° C., after which silicate precipitate was filtered, washed, spray-dried to 10.0% maximum moisture and micronized to an average particle size of 4.9 ⁇ m.
  • Example 2 The product silicate pigment in accordance with the invention (referred to hereinafter as “Example 2”) exhibited the characteristics reported in Table I.
  • a reactor was charged with 181 liters of a 13.3% solution of sodium silicate.
  • the silicate solution was heated in the reactor to 65° C., then more of the same silicate solution was added to the reactor at 6.3 LPM while, simultaneously, a sulfuric acid/alum mixture of 11.4% sulfuric acid and 15.4% alum was added at 4.1 LPM.
  • the ratio of the acid to alum in the added mixture was 1:0.3.
  • the silicate addition was halted, and the acid/alum addition continued for approximately 14 minutes.
  • the reaction mixture was then allowed to digest for 10 minutes at 65° C., after which silicate precipitate was filtered, washed, spray-dried to 10.0% maximum moisture and micronized to an average particle size of 5.2 ⁇ m.
  • Example 3 The product silicate pigment in accordance with the invention (referred to hereinafter as “Example 3”) exhibited the characteristics reported in Table I.
  • Example 2 Example 3 product product product % Moisture (105°, 2 hr.) 8.3 9.5 7.7 % LOI (900° C., 2 hr.) 10.0 6.9 9.1 % SiO 2 81.1 85.6 85.2 % Al 2 O 3 4.3 5.4 2.9 % Na 2 O 3.2 3.6 2.2 % Na 2 SO 4 0.89 0.24 0.38 Oil absorption, cc/100 g 205 200 214 APS, ⁇ m 7.3 4.9 4595 B.E.T., m 2 /g 493 460 CTAB, m 2 /g 201 188 191 Pore vol., cc 4.92 5.10 5.01 Pore max., ⁇ m 0.015 0.0135 0.025
  • Example 1 silicate pigment To compare the rheologies of the Example 1 silicate pigment to conventional silicas A and B, slurries were prepared for each of the pigments and evaluated for Brookfield viscosity at various spindle speeds. The results are shown in Table III.
  • Example 1 slurry As shown in Table III, even though the % solids of the Example 1 slurry was far greater than that used for the silica A and B slurries, the Brookfield viscosity at every spindle speed was significantly and surprisingly lower for the Example 1 slurry. As described above and demonstrated in this example, markedly higher solids content is achieved with the invention without the detrimental viscosity build typically associated with highly porous/high surface area pigments, thereby allowing more silicate pigment to be applied to and retained on coated print recording media. As a result, the amount of ink dye positioned in the path of light reflected from the substrate to the eye is maximized while, at the same time, the amount of dye absorbed in the pigment layer or substrate layer is minimized.
  • Coating colors were evaluated using a Brookfield RVT viscometer to determine the low shear viscosity. All coating colors were adjusted to 33 ⁇ 0.5% total solids. As revealed in Table V, the coating containing a silicate pigment in accordance with the invention (Coating Color C) exhibited much better (i.e., lower) low shear viscosity at 10, 50 and 100 RPM values than the coating containing the conventional silica pigments (Coating Colors A and B).
  • Example 1 the rheological behavior of a silicate pigment produced as described in Example 1 was compared to a conventional hybrid-gel silica pigment used commercially in coating applications.
  • Table VI reveals that the slurry containing the Example 1 silicate exhibited reduced low shear Brookfield viscosity as compared with the conventional silica pigment slurry, which is particularly surprising in light of the significantly higher solids content of the Example 1 pigment slurry.
  • the high shear rheology of the slurries was also compared, and the results are reported in Table VII.
  • the high-solids pigment slurry containing the Example 1 silicate initially exhibited higher viscosity than the low-solids comparative hybrid-gel silica slurry.
  • the Example 1 pigment slurry even at a much higher solids content, exhibited high shear viscosity and hysteresis low shear viscosity similar to the comparative hybrid-gel silica slurry at a low solids content.
  • a high quality coating color for non-impact printing applications was produced from the silicate pigment of Example 2 as described in Table VIII.
  • a coating color was prepared with a hybrid-gel silica commercially used in ink jet coatings.
  • Coating Color E produced using a silicate pigment in accordance with the invention
  • Coating Color D exhibited superior low shear viscosity and high shear rheology as compared with the conventional hybrid-gel silica based Coating Color D.
  • silicate pigments in accordance with the invention were compared to a conventional pigments in terms of color performance.
  • Silicate pigments in accordance with the invention referred to as Inventive Example A and Inventive Example B, were prepared as follows.
  • Inventive Example A was prepared by charging a reactor with 278 liters of a 13.3% solution of sodium silicate. The silicate solution was heated in the reactor to 65° C., then more of the same silicate solution added to the reactor at 9.7 LPM while, simultaneously, a sulfuric acid/alum mixture of 11.4% sulfuric acid and 15.4% alum was added at 6.3 LPM. The ratio of the acid to alum in the added mixture was 1:0.81.
  • silicate addition was halted, and the acid/alum addition continued for approximately 14 minutes.
  • the reaction mixture was then allowed to digest for 10 minutes at 65° C., after which silicate precipitate was filtered, washed, spray-dried to 10.0% maximum moisture and milled to an average particle size of 4.4 ⁇ m.
  • Inventive Example B was prepared by charging a reactor with 181 liters of a 13.3% solution of sodium silicate. The silicate solution was heated in the reactor to 75° C., then more of the same silicate solution was added to the reactor at 6.3 LPM while, simultaneously, a sulfuric acid/alum mixture of 11.4% sulfuric acid and 15.4% alum was added at 4.1 LPM. The ratio of the acid to alum in the added mixture was 1:0.67. After 47 minutes of the simultaneous addition, the silicate addition was halted, and the acid/alum addition continued for approximately 14 minutes. The reaction mixture was then allowed to digest for 10 minutes at 75° C., after which silicate precipitate was filtered, washed, spray-dried to 10.0% maximum moisture and micronized to an average particle size of 5.7 ⁇ m.
  • Pigment slurries were produced from Inventive Examples A and B, and from a conventional silica. The slurries were incorporated into coating colors which were then applied to a suitable fine paper basestock using a laboratory bench blade coater. The coated papers were calendered to simulate machine calendering, allowed to equilibrate at TAPPI standard conditions and printed using an Hewlett Packard Color Deskjet printer. An X-rite Model 428 handheld densitometer was used to evaluate the color density of solid cyan, yellow and magenta printed areas. The densitometer readings were used to calculate the Composite Color Density (CD) through the formula ⁇ (OD cyan +OD yellow +OD magenta ), and the results are shown in Table X.
  • CD Composite Color Density
  • the Examples demonstrate the surprising rheological and color performance of the invention as compared with conventional pigments.
  • the unique combination of high porosity, high surface area and low viscosity build provided by the invention enables improved coating performance for print recording media applications.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Ink Jet Recording Methods And Recording Media Thereof (AREA)
  • Paper (AREA)
  • Pigments, Carbon Blacks, Or Wood Stains (AREA)
US09/072,424 1998-05-04 1998-05-04 High surface area silicate pigment and method Expired - Fee Related US6171384B1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US09/072,424 US6171384B1 (en) 1998-05-04 1998-05-04 High surface area silicate pigment and method
CA002334426A CA2334426A1 (fr) 1998-05-04 1999-05-03 Pigment a base de silicate, a surface efficace elevee, et procede de production associe
EP99920300A EP1077899B1 (fr) 1998-05-04 1999-05-03 Pigment a base de silicate, a surface efficace elevee, et procede de production associe
DE69910198T DE69910198D1 (de) 1998-05-04 1999-05-03 Pigment auf silicat-basis mit hoher spezifischer oberfläche und verfahren zu seiner herstellung
PCT/US1999/009664 WO1999057059A1 (fr) 1998-05-04 1999-05-03 Pigment a base de silicate, a surface efficace elevee, et procede de production associe

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Cited By (3)

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Publication number Priority date Publication date Assignee Title
US6616916B1 (en) 2001-12-10 2003-09-09 J. M. Huber Corporation Transparent dentifrices
US7008617B1 (en) 2001-12-10 2006-03-07 J.M. Huber Corporation Precipitated silicas
US20110111143A1 (en) * 2007-12-04 2011-05-12 Qi Sun Abrasion resistant media

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101148258B (zh) * 2007-08-31 2010-09-15 安徽工业大学 一种水合硅酸铝的制备方法

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WO1999057059A1 (fr) 1999-11-11
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DE69910198D1 (de) 2003-09-11
EP1077899A1 (fr) 2001-02-28

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